Cylinder lock



Get. 26, 1937.

E. N. JACOBl v 2,097,189

Filed June 5, 1936 I 2 Sheets-Sheet 1 E. N. JACOBI CYLINDER LOCK Oct. 26, 193 7.

Filed June 5, 1956 2 Sheets-Sheet 2 Patented Oct. 26, 1937 UNITED STATES PATENT OFFICE CYLINDER LOCK Application June 5, 1936, Serial No. 83,674

8 Claims.

This invention relates to improvements in looks and refers particularly to cylinder locks.

It is an object of this invention to provide an improved and simplified manner of removably securing the cylinder of a lock of the character described in its casing.

More specifically it is an object of this invention to provide a removable cylinder lock in Which the cylinder is positively held against withdrawal by means of a bayonet slot connection and in which releasable stop means normally holds the cylinder against rotation to its releasing or withdrawing position.

A further object of this invention is to provide common means for preventing rotation of the cylinder to its withdrawing position and also to define the normal limits of rotation of the cylinder.

A still further object of this invention resides in the provision of a lock of the character described wherein release of the stop means which prevents rotation of the cylinder to its withdrawing position is effected by means of a tool inserted into the lock from the front end thereof.

With the above and other objects in view which will appear as the description proceeds, this invention resides in the novel construction, combination and arrangement of parts substantially as hereinafter described and more particularly 30' defined by the appended claims, itbeing understood-that such changes in the precise embodiment of the herein disclosed invention may be made as come within the scope of the claims.

The accompanying drawings illustrate one complete example of the physical embodiment of the invention constructed according tothe best mode so far devised for the practical application of the principles thereof, and in which:

' Figure l is a longitudinal section View through 40 a lock embodying this invention and showing the cylinder in its unlocked position of rotation;

Figure 2 is a cross section view taken through Figure 1 on the plane of the line 2-2;

Figure 31s a cross section view through Figure 1 on the plane of the line 3-3;

Figure 4 is a View similar to Figure 1, showing the manner in" which the cylinder is released for rotation to its withdrawing position; and

Figure 5is a cross section View similar to Figure 2 but showing the cylinder turned to its withdrawing position.

Referring now more particularly to the accompanying drawings in which like numerals indicate like parts throughout the several views,-the numeral '5 designates a mounting member or casing of the lock which in the present instance is illustrated as the handle of an automobile door. As is customary, the mounting member 5 has a bore 6 to receive a cylinder 1, the cylinder 1 being inserted into the'bore through its open front end. Theinner end of the cylinder is arranged for driving coaction with an adaptor 8 through which rotation of the cylinder is imparted to the latching mechanism (not shown).

The driving connection between the cylinder and the adaptor 8 comprises an eccentric driving cam 9 projecting from a reduced neck or inner end portion ID on the cylinder and engaging in a recess H in the head of the adaptor 8. This connection permits the cylinder to be withdrawn without disturbing the adaptor.

The casing or mounting member 5 has two diametrically opposed longitudinal tumbler receiving grooves l2 and I3 extending in from a counterbore I4 in the front .end of the casing. The groove l2 extends to the extreme bottom of the bore 6, but the groove I3 is considerably shorter.

Mounted in the cylinder are the usual locking tumblers l5 which are projectable into the tumbler receiving groove l3 to secure the cylinder against rotation in a locked position and projectable into the longtumbler groove l2 during insertion and removal of a key It used to retract the tumblers and free the cylinder for rotation.

The cylinder is removably secured in the bore 6 by a bayonet slot connection with the casing at the mouth of the bore 6 comprising two circumferentially aligned lugs I! on the cylinder at a slight distance inwardly from its outer head l8 which lugs engage in back of an arcuate ledge I9 projecting in from the counterbore l4 and extending circumferentially from one edge of the groove I2 to the adjacent edge of the groove IS.

The lugs l! are so disposed circumferentially with respect to the arcuate length of the ledge ii] that during the normal rotation of the cylinder between locked and unlocked positions, which requires one hundred and eighty degrees, one of the lugs I1 is at all times in back of the ledge l9 thus positively retaining the cylinder against withdrawal. Withdrawal of the cylinder is possible only upon rotation of the cylinder beyond its unlocked position a distance sufiicient to carry both of its lugs I! out of alignment with the ledge l9.

Rotation of the cylinder to this withdrawing position is normally prevented by a stop washer 20 non-rotatably held in the bore of the casing and. engageable with a stop lug 2| projecting from the side of the reduced neck or projection III on the inner end of the cylinder for defining the normal limits of rotation of the cylinder.

The Washer 20 has an outer diameter substantially equal to that of the cylinder so as to be slidably disposed in the bore 6 and its bore 22 is of such size as to accommodate the reduced neck or projection Ii). Throughout its major circumference, the bore 22 in the washer is enlarged as at 23 to accommodate the stop lug 2| on the cylinder, the termini of the enlarged portion 23 providing abutments 24 engageable by the lug 2| to normally limit the rotation of the cylinder to one hundred and eighty degrees.

The washer is held against rotation with re-' spect to the casing by two outwardly projecting ears or lugs 25 and 26 which are received in the long tumbler groove l2, and a third longitudinal groove 21, respectively, formed in the casing 5 in communication with its bore. This manner of securing the stop washer against rotation, however, does not interfere with flatwise movement thereof along the axis of the lock, and to hold the stop washer in its normal operative position engaging the inner end of the cylinder, a compression spring 30 is confined between it and the adaptor 8.

As long as the stop washer is retained in this normal position engaging the inner end of the cylinder, the stop lug 2| coacting with the abutments 24 on the stop Washer restricts the rotation of the cylinder to the one hundred and eighty degrees comprising its normal range of motion.

However, upon rearward displacement of the stop washer, as shown in Figure 4 to dispose the same rearwardly of the lug Z I, rotation of the cylinder beyond its normal limits is permitted. Such rearward displacement of the stop washer may be eifected by means oi: a tool 33. The tool 33 comprises a wire stem having a head 34 arranged to overlie the fiat head of the key I6. In using the tool 33, it is inserted through a recess 35 in the edge of the cylinder head l8 which aligns with the longitudinal groove 21 when the cylinder is in its unlocked position of rotation until its inner end strikes the lug 26 on the washer and thereby pushes the washer back. The head 34 on the too-l overlies the key in this position which makes it easy to retain the releasing tool in inwardly pressed position and simultaneously turn the cylinder.

It will be noted from Figure 2 that the notch or recess 35, the bottom of which dips down beneath the cylindrical surface of the cylinder proper a slight distance, is located adjacent one side edge of the longitudinal groove 21 when the cylinder is in its unlocked position of rotation. Consequently, it is possible to turn the cylinder with the tool 33 in'place a distance sufficient to carry the lug 2| past the adjacent abutment 24, after which the lug 2| holds the stop washer in its displaced position so that the tool may be withdrawn and the cylinder turned the required number of degrees to carry both of its lugs I! out of locking engagement with the ledge l9.

As noted hereinbefore, when the cylinder has been turned to a position, such as shown in Figure 5 at which both of. its lugs I! are disengaged from behind the ledge 9, the cylinder is free for withdrawal.

To insert the cylinder, it is only necessary to press the same inwardly against the action of the spring 30 until its lugs H are disposed inwardly of the ledge l9 whereupon the cylinder may be turned clockwise to carry the lugs I! in back rotatably mounted therein, means for positively holding the cylinder against withdrawal from the casing bore except in a predetermined position of rotation, and means for normally preventing rotation of the cylinder to said position comprising an eccentric stop lug projecting from the inner end of the cylinder, a stop washer non-rotatably held in the casing bore and engaging the inner end of the cylinder, said stop washer having an arcuate passage to accommodate the eccentric stop lug, the ends of said arcuate passage forming an abutment engageable with the eccentric stop lug to define the normal limits of rotation of the cylinder, and a spring for holding the stop washer in its positive position engaging the inner end of the cylinder while allowing inward displacement of the stop washer beyond the end of the eccentric lug to free the cylinder for rotation to said predetermined position at which it may be withdrawn from the casing bore.

2. In a lock, a bored casing, a lock cylinder rotatable therein, and means to define the normal rotation of the cylinder comprising an eccentric lug projecting from the inner end of the cylinder, a stop washer having an arcuate passage in which the eccentric lug is received, the ends of said arcuate passage forming abutments engageable by the eccentric lug, means for holding said stop washer against rotation with respect to the casing, and yieldable means for holding the stop washer in cooperative relationship with the eccentric lug while permitting the displacement of the stop washer out of cooperative relationship with the eccentric ing.

3. In a lock, a bored casing, a lock cylindernon-rotatable therein, and means for defining the normal limits of rotation of the cylinder comprising a stop member non-rotatably held in the casing bore and engaged with the inner end of the cylinder, means on the cylinder cooperative with the stop washer as long as the stop washer is engaged with the inner end of the cylinder, and spring means for holding the stop washer against the inner end of the cylinder while permitting displacement thereof to an inoperative position freeing the cylinder for rotation beyond one of its normal limits.

4. In a lock, a bored casing having a longitudinal groove communicating with its bore and opening to the front end thereof, a lock cylinder rotatable in the bore, and means for defining the normal limits of rotation of the cylinder comprising a stop member slidable in the casing bore inwardly of the cylinder and having circumferentially spaced abutments, an eccentric lug on the inner end of the cylinder engageable with said abutments as long as the stop member is in a predetermined operative position from which it is movable axially into the bore of the casing, spring means opposing such inward movement of the stop member and holding the same in an operative position, and a lug on the stop member slidably disposed in said longitudinal groove for holding the stop member against rotation in the through and the casing having a longitudinal' groove opening to its bore with its front end arranged to be covered by the head of the cylinder and to be accessible through said opening in the cylinder head upon alignment of the opening therewith, and means to define the normal limits of rotation of the cylinder comprising a stop Washer slidable in the casing bore inwardly of the cylinder and having an arcuate passage with the ends thereof forming stop abutments, an eccentric lug projecting from the cylinder inner end into said arcuate passage to cooperate with the abutments on the stop washer as long as the washer is held against the inner end of the cylinder, a spring holding the stop washer against the inner end of the cylinder, and a lug projecting out from the stop washer and slidably disposed in the longitudinal groove to hold the stop washer against rotation and to provide means engageable by a tool inserted through the opening in the cylinder head and the longitudinal groove for displacing said stop washer inwardly beyond the eccentric lug to thereby free the cylinder for rotation past one of its normal limits.

6. In a lock, a bored casing, a lock cylinder mounted therein for rotation between predetermined limits of normal operation, said cylinder having an enlarged head provided with a circumferential groove accessible from the underside of the enlarged head, means for removably holding the cylinder in the casing including a projection extending from the casing into said circumferential groove, said projection being disengageable from the groove upon rotation of the cylinder beyond one of its normal limits of rotation, means for defining the normal limits of rotation of the cylinder, comprising a stop abutment on the cylinder and an axially movable non-rotatable plate yieldingly retained in an operative position at the inner end of the cylinder to be engageable by said cylinder carried stop abutment, said plate being accessible for movement out of the path of the cylinder carried stop abutment in the unlocked position of rotation of the cylinder.

7. In a look, a bored casing, a lock cylinder mounted therein for rotation between normal limits of operation, means for defining said limits comprising stop abutments on the cylinder and a stop member splined to the casing for axial movement and arranged to engage said stop ,abutments in one position of axial movement and to be freed from engagement with said stop abutments in another axial position, said splined member being protected against access except in one position of rotation of the lock cylinder, and a bayonet joint between the lock cylinder and casing to retain the cylinder against withdrawal from the casing except in a position of rotation beyond the normal limits of rotation.

8. In a look, a bored casing having a slot extending along the bore, a lock cylinder rotatably mounted therein and axially removable from the bore, tumblers carried by the cylinder and engageable in said slot, bayonet joint means for retaining-the cylinder against withdrawal except when the cylinder is in a predetermined position of rotation, a member connected to said casing by a spline joint in said slot, abutments on said member, and abutments on the cylinder engageable with the abutments of said member to prevent rotation of thecylinder to said predetermined position, said abutments being disengageable by axial movement of said member.

EDWARD N. JACOBI. 

